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Search Results: 1 - 10 of 6429 matches for " Juana; Herrera-Valdivia "
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Análisis de la abundancia, dominancia y diversidad de la comunidad de peces demersales de profundidad de 90 a 540 metros en el Golfo de California, México
Acevedo-Cervantes,Alejandro; López-Martínez,Juana; Herrera-Valdivia,Eloisa; Rodríguez-Romero,Jesús;
Interciencia , 2009,
Abstract: an analysis of the demersal fish community of the eastern continental slope of the gulf of california, méxico, was performed. samples were obtained with a trawl net at 90-540m of depth by three separate research surveys. temperature-salinity diagrams showed two main water masses, one represented by the gulf of california water mass, down to a depth of 540m, and a deeper one corresponding to the sub-surface pacific water mass. depth profiles for temperature and dissolved o2 were obtained, and plots constructed from them. these profiles showed that temperature and o2 concentration decreased gradually along a smooth gradient to a minimun of 7°c and 0.1ml·l-1, respectively, at 540m deep. seventy-one species belonging to 35 families were found. average maximum and minimum overall diversity (h′) values were 2.2 and 0.8 bits/ind and the specific richness (r) index value were 3.6 and 0.2. caelorinchus scaphopsis, merluccius productus, pleuronichthys verticals, sebastes spinorbis, microlephidium verecundum, lepophidium prorates. and lophiodes spilurus were the most dominant species, based on the relative importance index. the fish community structure suggests two different communities with two groups of species, one at 90-270m deep that shows strong associations with moderate to high diversity values and specific richness, with shared dominance by numerous species, and a second community made out of typical deep water species, with low diversity and dominance featured by a few species. the data suggests that environmental conditions play an important role in the distribution and the community structure of these species.
Nuevo registro del tiburón narizón, Apristurus nasutus de Buen, 1959, (Carcharhiniformes: Scyliorhinidae) en el Golfo de California, México
Acevedo-Cervantes, Alejandro;López-Martínez, Juana;Herrera-Valdivia, Eloisa;Rodríguez-Romero, Jesús;
Hidrobiológica , 2009,
Abstract: a total of 143 organism of apristurus nasutus (de buen, 1959), were caught in a research survey at june 2007. the samples were obtained by means of a trawl net at 250 - 460 m depth, in the middle and north part of gulf of california. this finding represents the first record of apristurus nasutus in mexican waters and therefore gives it a wider range the enlargement of his distribution. the specimens caught showed a schooling behavior, most of them in a reproductive stage.
Nuevo registro del tiburón narizón, Apristurus nasutus de Buen, 1959, (Carcharhiniformes: Scyliorhinidae) en el Golfo de California, México New record of Largenose Catshark, Apristurus nasutus de Buen, 1959, (Carcharhiniformes: Scyliorhinidae) in the Gulf of California, Mexico
Alejandro Acevedo-Cervantes,Juana López-Martínez,Eloisa Herrera-Valdivia,Jesús Rodríguez-Romero
Hidrobiológica , 2009,
Abstract: Se recolectaron 143 ejemplares de tiburón narizón Apristurus nasutus (de Buen, 1959), durante un crucero de prospección en junio de 2007. Las muestras provinieron de tres lances realizados con una red de arrastre entre los 250 y los 460 m de profundidad, en la parte media y alta del Golfo de California. El hallazgo representa el primer registro de la especie en aguas mexicanas y por consiguiente la ampliación de su ámbito de distribución. Los organismos capturados se encontraron agrupados en cardumen, la mayoría en fase reproductiva. A total of 143 organism of Apristurus nasutus (de Buen, 1959), were caught in a research survey at June 2007. The samples were obtained by means of a trawl net at 250 - 460 m depth, in the middle and north part of Gulf of California. This finding represents the first record of Apristurus nasutus in Mexican waters and therefore gives it a wider range the enlargement of his distribution. The specimens caught showed a schooling behavior, most of them in a reproductive stage.
Composición taxonómica y aspectos zoogeográficos de peces de profundidad (90-540m) del Golfo de California, México Taxonomic composition and zoogeographical aspects of deep sea fishes (90-540m) from the Gulf of California, Mexico
Juana López-Martínez,Alejandro Acevedo-Cervantes,Eloisa Herrera-Valdivia,Jesús Rodríguez-Romero
Revista de Biología Tropical , 2012,
Abstract: El Golfo de California tiene una alta variedad de ecosistemas que permiten obtener diferentes servicios y los peces juegan un papel prominente en la ecología, evolución y economía de este. De los peces, las especies costeras han sido reportadas previamente para la mayoría de las zonas litorales, especialmente aquellas especies que son sujetas a explotación pesquera, sin embargo, poco se conoce de las especies que habitan en zonas marinas profundas, debido a lo difícil de su muestreo. Se presenta el listado sistemático y la afinidad biogeográfica de los peces recolectados en tres cruceros de investigación en el Golfo de California con red de arrastre. Se efectuaron 74 lances exploratorios y se capturó un total de 9 898 peces, integrados por dos clases, 15 órdenes, 35 familias, 53 géneros y 70 especies. Las familias mejor representadas en número de especies son: Paralichthyidae (ocho especies), Serranidae (seis), Scorpaenidae y Triglidae (cinco cada una). Las familias típicas de aguas profundas son: Ophidiidae, Moridae, Lophiidae, Scorpaenidae, Triglidae, Paralichthydae, Pleuronectidae y Cynoglossidae. El intervalo de tallas encontrado varió de 13cm en la vaca doble hocico (Bellator xenisma) a 234cm en el sable del Pacífico Trichurus nitens. La afinidad biogeográfica muestra que dominaron las especies de afinidad al Pacífico Oriental Tropical (POT), seguidos por las especies de las provincias de San Diego-Panámica; San Diego-Panámica-peruano-chilena y provincias Oregoniana-de Cortés respectivamente. Se encontró un traslape biogeográfico de la fauna, la cual es reflejo de la posición geográfica del Golfo de California en los límites de distribución de los elementos en donde se manifiestan especies de afinidades templadas, tropicales y de transición templado-cálido, divisiones que caracterizan al Golfo de California. Los estatus taxonómicos en peces con un enfoque de composición, ubicación, caracterización y zoogeografía son fundamentales para desarrollar cualquier tema de biodiversidad y manejo pesquero Taxonomic composition and zoogeographical aspects of deep sea fishes (90-540m) from the Gulf of California, Mexico. The Gulf of California has a high variety of ecosystems that allow different services and the fishery resources play a prominent role in its ecology, evolution and economics. Fish coastal species have been previously reported for most coastal areas, especially those species that are subject to fishing, however, little is known on the species from deep sea zones, due to sampling cifficulties. We studied the deep sea fishes collected with trawl n
Peces de la fauna de acompa?amiento en la pesca industrial de camarón en el Golfo de California, México
López-Martínez,Juana; Herrera-Valdivia,Eloisa; Rodríguez-Romero,Jesús; Hernández-Vázquez,Sergio;
Revista de Biología Tropical , 2010,
Abstract: bycatch fish species from shrimp industrial fishery in the gulf of california, mexico. the shrimp fishery in the gulf of california is one the most important activities of revenue and employment for communities. nevertheless, this fishery has also created a large bycatch problem, principally fish. to asses this issue, a group of observers were placed on board the industrial shrimp fleet and evaluated the eastern side of the gulf during 2004 and 2005. studies consisted on 20kg samples of the capture for each trawl, and made possible a systematic list of species for this geographic area. fish represented 70% of the capture. a total of 51 101 fish were collected, belonging to two classes, 20 orders, 65 families, 127 genera, and 241 species. the order perciformes was the most diverse with 31 families, 78 genera, and 158 species. the best represented families by number of species were: sciaenidae (34) and paralichthyidae (18) and haemulidae and carangidae (16 each). the best represented genera in number of species were symphurus (nine) and diplectrum and cynoscion (six); other important genera were larimus and porichthys with five species each. the best represented species in number were syacium ovale, pseudupeneus grandisquamis, haemulopsis nitidos, diplectrum pacificum, synodus scituliceps, balistes polylepis, eucinostomus currani, eucinostomus gracilis, porichthys analis, chloroscombrus orqueta, selene peruviana, orthopristis reddingi, etropus crossotus, scorpaena sonorae and urobatis halleri. the number of recorded species is notably high, compared with demersal fauna of other areas of the mexican pacific, such as gulf of tehuantepec (178), nayarit, michoacán, guerrero (174, 120 and 166), jalisco and colima (161 species), and those of the western coast of the baja california peninsula (220 species). rev. biol. trop. 58 (3): 925-942. epub 2010 september 01.
Population parameters of the Pacific flagfin mojarra Eucinostomus currani (Perciformes: Gerreidae) captured by shrimp trawling fishery in the Gulf of California
López-Martínez,Juana; Rodríguez-Romero,Jesús; Hernández-Saavedra,Norma Y; Herrera-Valdivia,Eloisa;
Revista de Biología Tropical , 2011,
Abstract: shrimp trawling fishery in the gulf of california captures a wide variety of non-target species of fish, crustaceans, and mollusks that are relatively unknown. the pacific flagfin mojarra eucinostomus currani is a frequently found species in these catches, nevertheless, nothing is currently known about its population dynamics. to contribute to the knowledge on this fish species, we studied the size structure, growth, mortality, and the recruitment pattern during the 2004-2005 seasons. a total of 6 078 mojarra were captured from 350 samples, with minimum and maximum lengths of 4.5cm and a maximum of 21.0cm. the average total length of the four major cohorts was 11.4, 13.7, 15.6 and 18.0cm, corresponding to ages 0.9, 1.2, 1.6 and 2.2 years, respectively, being the most abundant the 1.2 year-old group. the instant growth coefficient indicated moderate growth rates (ks=0.81/year, ke=0.85/year), corresponding to individuals living between 3.5 to 3.7 years. the estimated asymptotic lengths was l∞=21.8cm. in general, the population could be considered healthy: natural mortality (m=1.53/year); total mortality (z=2.73 /year); condition factor (k=0.01072); fishery mortality (f=1.2/ year) and exploitation rate (e=0.43/year). the maximum reproduction period almost coincided with the closed season for shrimp fishing (march to august), thus we concluded that survival of the species is ensured because reproduction is indirectly protected. rev. biol. trop. 59 (2): 887-897. epub 2011 june 01.
Population dynamics and spatial distribution of flatfish species in shrimp trawl bycatch in the Gulf of California Dinámica poblacional y distribución espacial de los lenguados capturados incidentalmente en arrastres camaroneros en el Golfo de California
Carlos Hiram Rábago-Quiroz,Juana López-Martínez,Eloisa Herrera-Valdivia,Manuel O. Nevárez-Martínez
Hidrobiológica , 2008,
Abstract: By determining the specific composition, spatial distribution and population dynamics of flatfish species captured in shrimp trawls' bycatch in the Gulf of California, this study aims to contribute to the knowledge of bycatch fish population which has thus far been of little interest. Samplings were taken from shrimp trawls' in two fishing seasons (2002 and 2003) onboard shrimp fleets and also from two research cruises during closed shrimp season. The results showed 15 species of flatfish belonging to 5 families: Achiridae, Bothidae, Cynoglossidae, Pleuronectidae and Paralichthyidae. Paralichthyidae was the most abundant with 9 species. The range in sizes of these flatfish species varied in total length from 20 to 380 mm, with the most frequent sizes ranging from 60 to 180 mm and only a few species of the Paralichthys genera surpassing 250 mm in total length. The growth estimate parameter for the most abundant flatfish species varied according to the longevity of these species. More than 50 % of the organisms sampled were of small size, and the majority of these were captured before the sexual maturity which may have caused a potential effect on the population; however the consequences of this action on the population are unknown. Con la determinación de la composición específica, distribución espacial y dinámica poblacional de las especies de lenguados capturadas incidentalmente por embarcaciones camaroneras en el Golfo de California, este estudio pretende contribuir al conocimiento en un nivel poblacional de especies capturadas incidentalmente, las cuales han sido de poco interés en las investigaciones. Se efectuaron muestreos de fauna de acompa amiento del camarón en dos temporadas de pesca (2002 y 2003) a bordo de barcos camaroneros y en dos cruceros de investigación durante la época de veda del camarón. Los resultados mostraron 15 especies de lenguados pertenecientes a cinco familias, siendo la familia Paralichthyidae la que presentó el mayor número de especies (9). El intervalo de tallas obtenido fue de 20 a 380 mm de longitud total, siendo las más frecuentes de 60 a 180 mm y sólo las especies del género Paralichthys rebasaron los 250 mm. Los parámetros de crecimiento estimados estuvieron de acuerdo a la longevidad de estas especies. Más del 50 % de los organismos fueron de tallas peque as y la mayoría fueron capturadas antes de su talla de primera madurez sexual, pudiendo tener potenciales efectos en las poblaciones; sin embargo las consecuencias de este hecho en las poblaciones son desconocidas.
Population parameters of the Pacific flagfin mojarra Eucinostomus currani (Perciformes: Gerreidae) captured by shrimp trawling fishery in the Gulf of California
Juana López-Martínez,Jesús Rodríguez-Romero,Norma Y Hernández-Saavedra,Eloisa Herrera-Valdivia
Revista de Biología Tropical , 2011,
Abstract: Shrimp trawling fishery in the Gulf of California captures a wide variety of non-target species of fish, crustaceans, and mollusks that are relatively unknown. The Pacific flagfin mojarra Eucinostomus currani is a frequently found species in these catches, nevertheless, nothing is currently known about its population dynamics. To contribute to the knowledge on this fish species, we studied the size structure, growth, mortality, and the recruitment pattern during the 2004-2005 seasons. A total of 6 078 mojarra were captured from 350 samples, with minimum and maximum lengths of 4.5cm and a maximum of 21.0cm. The average total length of the four major cohorts was 11.4, 13.7, 15.6 and 18.0cm, corresponding to ages 0.9, 1.2, 1.6 and 2.2 years, respectively, being the most abundant the 1.2 year-old group. The instant growth coefficient indicated moderate growth rates (K S=0.81/year, K E=0.85/year), corresponding to individuals living between 3.5 to 3.7 years. The estimated asymptotic lengths was L∞=21.8cm. In general, the population could be considered healthy: natural mortality (M=1.53/year); total mortality (Z=2.73 /year); condition factor (K=0.01072); fishery mortality (F=1.2/ year) and exploitation rate (E=0.43/year). The maximum reproduction period almost coincided with the closed season for shrimp fishing (March to August), thus we concluded that survival of the species is ensured because reproduction is indirectly protected. Rev. Biol. Trop. 59 (2): 887-897. Epub 2011 June 01. La pesquería de camarón del Golfo de California captura una amplia variedad de especies incidentales, relativamente no conocidas que incluye peces, crustáceos y moluscos. La mojarra bandera del Pacífico Eucinostomus currani es frecuentemente encontrada en las capturas del camarón y no hay información sobre su dinámica poblacional. La estructura de tallas, crecimiento, mortalidad y patrón de reclutamiento fueron determinados durante la temporada 2004-2005. De manera que se recolectaron 6 078 organismos de esta especie en 350 muestras, las tallas mínima y máxima fueron 4.5cm y 21.0cm. La talla media de las cuatro cohortes presentes fueron 11.4, 13.7, 15.6 y 18.0cm, correspondiendo a edades de 0.9, 1.2, 1.6 y 2.2 a os. El coeficiente instantáneo de crecimiento indica un crecimiento moderado (KS=0.81/a o, KE=0.85/a o), con una longevidad de 3.5 a os. La longitud asintótica estimada fue L∞=21.8cm. En general, la población se mostró saludable, con una mortalidad natural (M=1.53/a o); factor de condición (K=0.01072); mortalidad total (Z=2.73 /a o); mortalidad por pesca (F=1.2/a o) y tas
Peces de la fauna de acompa amiento en la pesca industrial de camarón en el Golfo de California, México
Juana López-Martínez,Eloisa Herrera-Valdivia,Jesús Rodríguez-Romero,Sergio Hernández-Vázquez
Revista de Biología Tropical , 2010,
Abstract: Composición taxonómica de peces integrantes de la fauna de acompa amiento de la pesca industrial de camarón del Golfo de California, México. La pesquería de camarón es la más importante en el Golfo de California y también la más problemática con respecto a las capturas incidentales en México. Dentro de la fauna de acompa amiento del camarón (FAC), el grupo de mayor abundancia son los peces. Se presenta listado sistemático de las especies de peces presentes en la FAC de la pesquería industrial de camarón en la costa oriental del Golfo de California. Durante 2004-2005 se implementó un sistema de observadores a bordo de la flota camaronera de Guaymas, Sonora, que recolectaron muestras de 20kg de la captura. Los peces representaron 70% de las capturas en número. Se recolectó un total de 51 101 ejemplares de peces, pertenecientes a dos clases, 20 órdenes, 65 familias, 127 géneros y 241 especies. El orden Perciformes fue el más diverso (31 familias, 78 géneros y 158 especies). Las familias mejor representadas en número de especies fueron: Sciaenidae y Paralichthyidae con 34 y 18 especies, Haemulidae y Carangidae aportaron 16 especies. Los géneros mejor representados fueron Symphurus con nueve y Diplectrum y Cynoscion con seis especies, otros géneros importantes fueron Larimus y Porichthys con cinco especies. El número de especies registrado es alto, comparado con la fauna demersal de otras áreas del Pacífico Mexicano. Esta alta riqueza de especies se puede atribuir a los sistemas de corrientes, surgencias, remolinos, topografía y batimetría únicas, que en conjunto originan un ecosistema dinámico con un amplio régimen térmico y una gran variedad de hábitats. Los resultados aqui presentados ponen de manifiesto que esta región del Golfo de California presenta una gran riqueza de especies, lo que abre diversas expectativas desde el punto de vista ecológico, pesquero, alimenticio y de manejo. Bycatch fish species from shrimp industrial fishery in the Gulf of California, Mexico. The shrimp fishery in the Gulf of California is one the most important activities of revenue and employment for communities. Nevertheless, this fishery has also created a large bycatch problem, principally fish. To asses this issue, a group of observers were placed on board the industrial shrimp fleet and evaluated the Eastern side of the Gulf during 2004 and 2005. Studies consisted on 20kg samples of the capture for each trawl, and made possible a systematic list of species for this geographic area. Fish represented 70% of the capture. A total of 51 101 fish were collected, belonging to two
Population dynamics and spatial distribution of flatfish species in shrimp trawl bycatch in the Gulf of California
Rábago-Quiroz, Carlos Hiram;López-Martínez, Juana;Herrera-Valdivia, Eloisa;Nevárez-Martínez, Manuel O.;Rodríguez-Romero, Jesús;
Hidrobiológica , 2008,
Abstract: by determining the specific composition, spatial distribution and population dynamics of flatfish species captured in shrimp trawls' bycatch in the gulf of california, this study aims to contribute to the knowledge of bycatch fish population which has thus far been of little interest. samplings were taken from shrimp trawls' in two fishing seasons (2002 and 2003) onboard shrimp fleets and also from two research cruises during closed shrimp season. the results showed 15 species of flatfish belonging to 5 families: achiridae, bothidae, cynoglossidae, pleuronectidae and paralichthyidae. paralichthyidae was the most abundant with 9 species. the range in sizes of these flatfish species varied in total length from 20 to 380 mm, with the most frequent sizes ranging from 60 to 180 mm and only a few species of the paralichthys genera surpassing 250 mm in total length. the growth estimate parameter for the most abundant flatfish species varied according to the longevity of these species. more than 50 % of the organisms sampled were of small size, and the majority of these were captured before the sexual maturity which may have caused a potential effect on the population; however the consequences of this action on the population are unknown.
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